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springmvc 过滤器和拦截器

 1. 拦截器:

interceptor

过滤器(filter)与拦截器(intercepter)相同点:
1) 都可以拦截请求,过滤请求
2) 都是应用了过滤器(责任链)设计模式

2.区别:

1) filter是范围比较大,配置web.xml中

2) intercepter范围比较小,配置在springmvc中

3) 在进入springmvc处理之前,要先处理web.xml的

 

springmvc-servlet.txml

 1    <bean id="localeResolver"
 2           class="org.springframework.web.servlet.i18n.SessionLocaleResolver"></bean>
 3     <mvc:interceptors>
 4         <!--<bean class="com.etc.interceptor.LoginInterceptor.etc.interceptor.MyInterceptor"></bean>-->
 5         <bean class="org.springframework.web.servlet.i18n.LocaleChangeInterceptor"></bean>
 6         <mvc:interceptor>
 7             <mvc:mapping path="/**"/>
 8             <mvc:exclude-mapping path="/login"/>
 9             <bean class="com.etc.interceptor.LoginInterceptor"/>
10         </mvc:interceptor>
11     </mvc:interceptors>

 

web.xml

1     <filter>
2         <filter-name>loginFilter</filter-name>
3         <filter-class>com.etc.fileter.MyFileter</filter-class>
4     </filter>
5     <filter-mapping>
6         <filter-name>loginFilter</filter-name>
7         <url-pattern>/</url-pattern>
8     </filter-mapping>

 

LoginInterceptor:

 1 package com.etc.interceptor;
 2 
 3 import org.springframework.web.servlet.HandlerInterceptor;
 4 import org.springframework.web.servlet.ModelAndView;
 5 
 6 import javax.servlet.http.HttpServletRequest;
 7 import javax.servlet.http.HttpServletResponse;
 8 import javax.servlet.http.HttpSession;
 9 
10 public class LoginInterceptor implements HandlerInterceptor {
11     @Override
12     public boolean preHandle(HttpServletRequest httpServletRequest, HttpServletResponse httpServletResponse, Object o) throws Exception {
13         HttpSession session=httpServletRequest.getSession();
14         if(session.getAttribute("login")==null){
15             httpServletResponse.sendRedirect("/login");
16             return false;
17         }else {
18             System.out.println("ip:"+httpServletRequest.getRemoteHost()+"url"+httpServletRequest.getRequestURL()) ;
19             return true;
20         }
21     }
22 
23     @Override
24     public void postHandle(HttpServletRequest httpServletRequest, HttpServletResponse httpServletResponse, Object o, ModelAndView modelAndView) throws Exception {
25 
26     }
27 
28     @Override
29     public void afterCompletion(HttpServletRequest httpServletRequest, HttpServletResponse httpServletResponse, Object o, Exception e) throws Exception {
30 
31     }
32 }

 

MyFileter:

 1 package com.etc.fileter;
 2 
 3 import javax.servlet.*;
 4 import javax.servlet.http.HttpServletRequest;
 5 import javax.servlet.http.HttpServletResponse;
 6 import javax.servlet.http.HttpSession;
 7 import java.io.IOException;
 8 
 9 public class MyFileter implements Filter {
10     @Override
11     public void init(FilterConfig filterConfig) throws ServletException {
12 
13     }
14 
15     @Override
16     public void doFilter(ServletRequest servletRequest, ServletResponse servletResponse, FilterChain filterChain) throws IOException, ServletException {
17 // 实际
18         HttpServletRequest httpServletRequest = (HttpServletRequest) servletRequest;
19         HttpServletResponse httpServletResponse = (HttpServletResponse) servletResponse;
20 
21         // 如果调用了这个方法,过滤器就会继承往下执行,
22         HttpSession session = httpServletRequest.getSession();
23         if (session.getAttribute("login") == null) {
24             //没有登陆
25             httpServletResponse.sendRedirect("/login");
26             //return false;
27         } else {
28             System.out.println("ip:" + httpServletRequest.getRemoteHost() + ",url:" + httpServletRequest.getRequestURL());
29             filterChain.doFilter(servletRequest, servletResponse);
30             //return true;
31         }
32 
33     }
34 
35     @Override
36     public void destroy() {
37 
38     }
39 }

 

作者:刘认真

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posted @ 2019-07-18 17:34  刘认真  阅读(9484)  评论(1编辑  收藏  举报